Firstly, before giving an answer, it´s neccesary to explain what is microevolution and what is natural selection.
Microevolution is the ocurrecence of small- scale changes in allele frequencies in a population, over a few generations. These changes are due to four different processes: mutation, selection (natural or artificial), gene flow and genetical drift. Microevolution can be contrast with macroevolution which is the ocurrence of large- scale changes in gene frequencies in a population over a geological time period.
Natural selection is the process by which certain heritable traits- those that make it more likely for an organism to survive and successfully reproduce- become more common in a population over successive generations.
The natural genetic variation within a population of organisms means that some individuals will survive and reproduce more successfully tan other in their current enviroment.
This link about natural selection says that natural selection has shaped the evolution of our species and has played an important role in patterning the human genome.
Here we can see that some people think that there is a correlation between genes predicted to be under negative sleection and genes implicated in certain hereditary diseases.
Another link about natural selection and human evolution says that natural selection isn´t the only mechanism of evolution because is impossible to have evolution without genetic variation. So, for evolution it´s necessary to have either mutation or recombination. In this website we can see an opinion that says that natural selection is only the process of adaption within species and plays an important role in the origin of new species.
This link about microevolution we can see an opinion that says that microevolution is the only evolution that is possible. In the following paragraph we can see the reasons for this opinion:
Firstly, the genes exist in all species for microevolution but not for macroevolution. Secondly, genetic similarities are no proof of common biological ancestry because it can´t be proved that these similarities are due to a common biological ancestry via chance mutations. The last reason is that genetic and biological similarities between species are because of a common designer rather than common ancestry.
In this page we can see a little opinion about natural selection. This opinion says that natural selection doesn´t produce biological variations, so that´s why it can´t be a way of human evolution
In spite the fact that microevolution is the only evolution that is possible, there aren´t fossils of partially involved species to candidate that a gradual process of evolution ever ocurred.
Firstly, before giving an answer, it´s neccesary to explain what is microevolution and what is natural selection.
Microevolution is the ocurrecence of small- scale changes in allele frequencies in a population, over a few generations. These changes are due to four different processes: mutation, selection (natural or artificial), gene flow and genetical drift.
Microevolution can be contrast with macroevolution which is the ocurrence of large- scale changes in gene frequencies in a population over a geological time period.
Natural selection is the process by which certain heritable traits- those that make it more likely for an organism to survive and successfully reproduce- become more common in a population over successive generations.
The natural genetic variation within a population of organisms means that some individuals will survive and reproduce more successfully tan other in their current enviroment.
This link about natural selection says that natural selection has shaped the evolution of our species and has played an important role in patterning the human genome.
Here we can see that some people think that there is a correlation between genes predicted to be under negative sleection and genes implicated in certain hereditary diseases.
Another link about natural selection and human evolution says that natural selection isn´t the only mechanism of evolution because is impossible to have evolution without genetic variation. So, for evolution it´s necessary to have either mutation or recombination. In this website we can see an opinion that says that natural selection is only the process of adaption within species and plays an important role in the origin of new species.
This link about microevolution we can see an opinion that says that microevolution is the only evolution that is possible. In the following paragraph we can see the reasons for this opinion:
Firstly, the genes exist in all species for microevolution but not for macroevolution. Secondly, genetic similarities are no proof of common biological ancestry because it can´t be proved that these similarities are due to a common biological ancestry via chance mutations. The last reason is that genetic and biological similarities between species are because of a common designer rather than common ancestry.
In this page we can see a little opinion about natural selection. This opinion says that natural selection doesn´t produce biological variations, so that´s why it can´t be a way of human evolution
In spite the fact that microevolution is the only evolution that is possible, there aren´t fossils of partially involved species to candidate that a gradual process of evolution ever ocurred.
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